Not sure if this has been covered before. I was wondering why the Australian flag on Qantas aircraft is 'inverted' with the union jack in the upper right hand corner and the southern cross on the left.

Its just like any other flag on an aircraft. It's on the aircraft so that it appears as though it is being swept backwards in the direction the wind would blow it on the airplane. Think of the left hand side (if it wasn't "inverted") as the flagpole and the wind blowing it backwards. That's probably not the clearest explanation in the world, but the best I can think of at the moment!

Quoting LY4XELD (Reply 2):t's on the aircraft so that it appears as though it is being swept backwards in the direction the wind would blow it on the airplane

Or the imaginary flagpole of the imaginary flag is to the front of the plane, with the flag flying behind it. The flag is not "inverted" on the starboard side: an assymetrical flag always looks like this way if the pole is to the right of the flag. In the case of the Australian flag, the Union Jack is always next to the pole; never away from the pole, which is the "home"/axis of the flag. The flag is conventionally shown as flying from a pole to the left, but with the pole removed. In this case the Union Jack is to the left. On the other hand, when the pole is to the right of the viewer, the Union Jack is always to the right, again next to the pole. The "conventional" (left-poled) flag is an abstract one, as no flag can fly without a pole. A real flag has both a left and right aspect, unless completely symmetrical.

I find it very important that a flag is inverted windy likewise. But adding a flag to a registration is not that important, however it looks good and logical when airlines invert their flag at the right side of the plane.

See what we did with VG Airlines, the Belgian flag was inverted at the right side of the plane's tailfin and outside winglet: you see how the inner side of the right winglet looks!! A brand name is not often invertable: